EP3032310B1 - Lichtemittierendes modul und lichtemittierende vorrichtung - Google Patents

Lichtemittierendes modul und lichtemittierende vorrichtung Download PDF

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Publication number
EP3032310B1
EP3032310B1 EP15197446.6A EP15197446A EP3032310B1 EP 3032310 B1 EP3032310 B1 EP 3032310B1 EP 15197446 A EP15197446 A EP 15197446A EP 3032310 B1 EP3032310 B1 EP 3032310B1
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EP
European Patent Office
Prior art keywords
light source
light emitting
light
tan
source unit
Prior art date
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Active
Application number
EP15197446.6A
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English (en)
French (fr)
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EP3032310A3 (de
EP3032310A2 (de
Inventor
Lee Im KANG
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LG Innotek Co Ltd
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LG Innotek Co Ltd
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Publication of EP3032310A3 publication Critical patent/EP3032310A3/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0066—Reflectors for light sources specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

Definitions

  • Embodiments relate to a light emitting module and a light emitting apparatus.
  • a light emitting diode is a kind of semiconductor device that converts electricity into light such as infrared light, for signal transmission and reception or that is used as a light source, using the characteristics of a compound semiconductor.
  • a group III-V nitride semiconductor has been widely used as a core material for light emitting devices, such as light emitting diodes (LEDs) or laser diodes (LDs), thanks to the physical and chemical properties thereof.
  • LEDs light emitting diodes
  • LDs laser diodes
  • LEDs do not contain any material that causes environmental pollution, such as mercury (Hg), which is used in conventional lighting apparatuses such as incandescent lamps and fluorescent lamps. Consequently, LEDs exhibit excellent environment-friendly characteristics. In addition, LEDs are characterized by a long lifespan and low power consumption. For these reasons, LEDs have replaced conventional light sources.
  • Hg mercury
  • LCD liquid crystal display
  • PDP plasma display panel
  • a backlight which is used in the LCD, may include a light emitting device, a lens located on the light emitting device, and a diffusion plate located on the lens. Based on the position of a light source, the backlight unit may be classified as an edge type backlight unit or a direct type backlight unit.
  • the edge type backlight unit the light source is located at the left and right sides and/or the upper and lower sides of an LCD panel, and light is uniformly dispersed over the entire surface of the LCD panel using a light guide plate. As a result, light uniformity is high, and it is possible to remarkably reduce the thickness of the LCD panel.
  • the direct type backlight unit which is generally applied to display apparatuses larger than 20 inches, a plurality of light sources is located under a panel.
  • the direct type backlight unit exhibits higher light efficiency than the edge type backlight unit. For this reason, the direct type backlight unit is mainly used for large-sized display apparatuses in which high luminance is critical. In addition, in the direct type backlight unit, it is possible to more easily reduce the size of a bezel than in the edge type backlight unit.
  • the direct type backlight unit In the direct type backlight unit, light emitted from the light emitting device is spread using the lens, and then exits through the diffusion plate.
  • a reflection plate In a case in which a reflection plate is located in order to reflect light exit from the lateral side of the light emitting device and to exit the reflected light to the upper side of the light emitting device, the brightness of light exiting from the edge of the diffusion plate is different from the brightness of light exiting from the center of the diffusion plate, since a beam angle of light emitted from the light emitting device through the lens is different from an angle of inclination of the reflection plate, whereby uniformity in light is reduced.
  • JP 2010 129655 A discloses an LED chip comprising features of claim one of the current invention.
  • US 2006/0102918 discloses a surface mount device light emitting diode comprising features of claim one of the current invention.
  • the invention provide a light emitting module according to claim 1 and a light emitting apparatus according to claim 12, that are capable of reducing the size of a bezel or removing the bezel with improved uniformity in light and low manufacturing cost.
  • the at least one light source unit may include a light source located on the board and a lens located on the light source.
  • a beam angle of light emitted from the at least one light source unit may be different from an angle of inclination of the reflection unit on the basis of a horizontal surface in a direction perpendicular to an optical axis.
  • the pattern may have a shape of at least one band.
  • the at least one band may include a plurality of bands arranged parallel to each other.
  • the pattern may include a plurality of blind holes or through holes arranged in a dotted-line or solid-line shape.
  • the distance between the blind holes or through holes arranged in the dotted-line shape may be less than the length of each of the blind holes or through holes.
  • a position at which the pattern is formed may be defined as follows.
  • X tan ⁇ ⁇ 2 ⁇ w ⁇ H tan ⁇ ⁇ 2 ⁇ tan ⁇ ⁇ 1
  • Y ⁇ tan ⁇ 1 tan ⁇ ⁇ 2 ⁇ w ⁇ H tan ⁇ ⁇ 2 ⁇ tan ⁇ ⁇ 1 + H or
  • Y ⁇ tan ⁇ 2 tan ⁇ ⁇ 2 ⁇ w ⁇ H tan ⁇ ⁇ 2 ⁇ tan ⁇ 1 + tan ⁇ 2 ⁇ w
  • X may indicate a distance from a contact point between the optical member and the reflection unit to the position in a first direction perpendicular to an optical axis
  • Y may indicate a distance between the position and the at least one light source unit in a second direction parallel to the optical axis
  • ⁇ 1 may indicate an angle at which the reflection unit is inclined with respect to a horizontal surface in the first direction,
  • k may be 0.35 to 0.65, and the width b of the beam angle a may be 14.1 degrees.
  • the pattern may be located along at least one selected from between a major axis and a minor axis of the reflection unit.
  • the pattern may be located higher than the upper surface of the at least one light source unit.
  • he pattern may be located symmetrically with respect to the at least one light source unit in a direction intersecting the optical axis.
  • the beam angle of light emitted from the at least one light source unit may be identical to the angle of inclination of the reflection unit on the basis of the horizontal surface in the direction perpendicular to the optical axis.
  • the pattern may be located asymmetrically with respect to the at least one light source unit in the direction intersecting the optical axis.
  • the at least one band comprises a plurality of bands arranged parallel to each other.
  • the width of the beam angle is 14.1 degrees.
  • the blind holes may be formed by punching.
  • the board may have an upper surface coated with a reflective material
  • the reflection unit may include at least one selected from between a metal and a metal oxide.
  • first,” “second,” “top,” “bottom,” etc. used herein may only be used to distinguish any entities or elements from each other without requiring or encompassing any physical or logical relationship between or order of the entities or elements.
  • an optical module 100 will be described with reference to the accompanying drawings.
  • the optical module 100 will be described using a Cartesian coordinate system (x, y, z).
  • Cartesian coordinate system x, y, z
  • the x-axis, the y-axis, and the z-axis are perpendicular to one another.
  • the disclosure is not limited thereto. That is, the x-axis, the y-axis, and the z-axis may intersect one another without being perpendicular to one another.
  • FIG. 1 is a plan view showing an optical module 100 according to an embodiment
  • FIG. 2 is a sectional view of the optical module 100 taken along line I-I' of FIG. 1 .
  • the optical module 100 includes a board 110, a plurality of light source units 120, a reflection unit 130, and an optical member 140.
  • the optical member 140 is omitted from FIG. 1 .
  • the light source units 120 may be located on the board 110.
  • An electrode pattern for connecting each light source unit 120 with an adaptor for supplying electric power may be formed on the board 110.
  • an electrode pattern for connecting each light source unit 120 with a corresponding adaptor may be formed on the upper surface of the board 110.
  • the board 110 may be a printed circuit board (PCB), made of polyethylene terephthalate (PET), glass, polycarbonate (PC), or silicon (Si).
  • PCB printed circuit board
  • the board 110 may be formed to have a film shape.
  • a single-layer PCB, a multiple-layer PCB, a ceramic board, or a metal core PCB may be selectively used as the board 110.
  • the upper surface of the board 110 may be coated with a reflective material for reflecting light that is emitted from the light source unit 120 and returns back without exiting to the optical member 140.
  • the optical module 100 may include more than or less than twelve light source units 120.
  • the light source units 120 are shown as being spaced apart from each other by the same distance.
  • the disclosure is not limited thereto. That is, in another a non claimed embodiment, the light source units 120 may be spaced apart from each other by different distances.
  • Each light source unit 120 may include a light source 122 and a lens 124.
  • the light source 122 is located on the board 110.
  • the light source 122 may be a light emitting diode (LED) chip.
  • the LED chip may be a blue LED chip or an ultraviolet LED chip.
  • the LED chip may be at least one selected from a red LED chip, a green LED chip, a blue LED chip, a yellow green LED chip, and a white LED chip or a combination thereof.
  • a white LED may be embodied by applying a yellow phosphor to a blue LED, by simultaneously applying a red phosphor and a green phosphor to a blue LED, or by simultaneously applying a yellow phosphor, a red phosphor, and a green phosphor to a blue LED.
  • the light source 122 may be located to overlap the lens 124 in a direction of optical axis LX (e.g. a y-axis direction). However, the disclosure is not limited to the specific position of the light source 122.
  • the light source 122 may be a top view type light emitting diode. Alternatively, the light source 122 may be a side view type light emitting diode.
  • the light emitting diode may have a vertical bonding structure, a horizontal bonding structure, or flip-chip bonding structure.
  • the light emitting diode may emit light having various wavelength bands.
  • the lens 124 is located on the light source 122 for refracting and transmitting light emitted from the light source 122.
  • the lens 124 may have at least one selected from planar or sectional shapes that are symmetric with respect to the optical axis LX.
  • the lens 124 may be made of a transparent material.
  • the lens 124 may be made of a material including silicon, polycarbonate (PC), acrylic resin such as polymethyl methacrylate (PMMA), or glass.
  • the lens 124 may have various shapes, such as a spherical shape and an aspherical shape. However, the disclosure is not limited thereto.
  • one lens 124 is shown as being located on one light source 122.
  • the disclosure is not limited thereto. That is, in a non claimed embodiment, one lens 124 may be located on a plurality of light sources 122, or a plurality of lenses 124 may be located on one light source 122.
  • the optical member 140 is located on the light source units 120 for diffusing light that is emitted from the light source units 120 or is reflected by the reflection unit 130.
  • a concave and convex pattern (not shown) may be formed on the upper surface of the optical member 140.
  • the optical member 140 may be formed to have a single layer or a plurality of layers.
  • the concave and convex pattern may be formed on the uppermost layer or any one of the layers.
  • the concave and convex pattern may be formed to have a stripe shape disposed according to the light source units 120.
  • the optical member 140 may include at least one sheet.
  • the optical member 140 may selectively include a diffusion sheet, a prism sheet, and a luminance enhancement sheet.
  • the diffusion sheet serves to diffuse light emitted from the light source units 120.
  • the prism sheet serves to guide the diffused light to a light emitting area.
  • the luminance enhancement sheet serves to enhance luminance.
  • an air layer is located between the optical member 140 and the light source units 120.
  • a light guide plate (not shown) may be located between the optical member 140 and the light source units 120.
  • the light guide plate may serve to guide light emitted from the light source units 120.
  • the light guide plate may be made of an acrylic resin such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), cycloolefin copolymer (COC), polyethylene naphthalate (PEN), polycarbonate (PC), polystyrene (PS), or methacrylate styrene (MS).
  • the reflection unit 130 may be located between the board 110 and the optical member 140 in an inclined state beside the light source units 120. In order to improve the uniformity in light emitted from the light source units 120, the reflection unit 130 serves to reflect the light emitted from the light source units 120 toward the optical member 140.
  • the reflection unit 130 may have various shapes, such as a sheet shape.
  • the reflection unit 130 may be made of at least one of a metal or a metal oxide.
  • the reflection unit 130 may be made of a metal, such as aluminum (Al), silver (Ag), or gold (Au), exhibiting high reflectance or a metal oxide, such as titanium dioxide (TiO 2 ), exhibiting high reflectance.
  • the reflection unit 130 may include patterns 132-1 to 132-4.
  • the patterns 132-1 to 132-4 may be formed so as to closer to the optical member 140 than to the board 110.
  • an angle of inclination ⁇ 1 (see FIG. 4 ) of the reflection unit 130 may be identical to or different from a beam angle of light emitted from the light source units 120.
  • the patterns 132-1 to 132-4 of the reflection unit 130 may be omitted.
  • the patterns 132-1 to 132-4 may not be omitted.
  • the patterns 132-1 to 132-4 may be configured to have a band shape.
  • the disclosure is not limited thereto.
  • the patterns 132-1 to 132-4 may be located along at least one selected from between a major axis and a minor axis of the reflection unit 130.
  • the z-axis, along which much more light source units 120 are arranged than the x-axis corresponds to the major axis of the reflection unit 130
  • the x-axis, along which much less light source units 120 are arranged than the z-axis corresponds to the minor axis of the reflection unit 130.
  • the patterns 132-1 to 132-4 may be arranged along both the major axis (e.g. the z-axis) and the minor axis (e.g. the x-axis) of the reflection unit 130.
  • the patterns 132-1 and 132-2 may be arranged along the major axis (e.g. the z-axis) of the reflection unit 130, and the patterns 132-3 and 132-4 may be arranged along the minor axis (e.g. the x-axis) of the reflection unit 130.
  • the patterns 132-1 to 132-4 may be located higher than the upper surfaces of the light source units 120. That is, referring to FIG. 2 , the patterns 132-1 to 132-4 may be located higher than the upper surfaces 124A of the light source units 120 in the direction of optical axis LX, i.e. the y-axis direction. However, the disclosure is not limited thereto. The position of the patterns 132-1 to 132-4 will hereinafter be described in detail with reference to FIG. 4 .
  • the patterns 132-1 to 132-4 may have at least one selected from between a planar shape and a sectional shape that are symmetric with respect to the light source units 120. That is, referring to FIG. 1 , the patterns 132-1 and 132-2 may be arranged symmetrically while three light source units 120 are located between the patterns 132-1 and 132-2 in the minor axis direction of the reflection unit 130, i.e. the x-axis direction, and the patterns 132-3 and 132-4 may be arranged symmetrically while four light source units 120 are located between the patterns 132-3 and 132-4 in the major axis direction of the reflection unit 130, i.e. the z-axis direction.
  • the patterns 132-1 and 132-2 may be arranged asymmetrically in the x-axis direction, and patterns 132-3 and 132-4 may be arranged asymmetrically in the z-axis direction. As previously described, the patterns 132-1 to 132-4 may be arranged symmetrically or asymmetrically in a direction intersecting the optical axis LX (e.g. at least one selected from between the x-axis direction and the z-axis direction).
  • FIGs. 3A to 3C are partially enlarged views showing embodiments A1, A2, and A3 of part 'A' shown in FIG. 1 .
  • the reflection unit 130 may have a pattern including a plurality of blind holes 132-2A spaced apart from each other in a dotted-line shape.
  • the reflection unit 130 may have a pattern 132-2C including a plurality of blind holes 132-2A1 and 132-2A2 spaced apart from each other in a dotted-line shape.
  • reflection unit 130 may have a pattern including a blind hole 132-2B extending in a solid-line shape.
  • the pattern 132-2C may be configured to have a plurality of bands, unlike what is shown in FIGs. 3A and 3B , showing that the patterns 132-2A and 132-2B are configured to have a single band. That is, as shown in FIG. 3C , the pattern 132-2C may have two bands 132-2A1 and 132-2A2, which may be parallel to each other. However, the disclosure is not limited thereto. That is, in another embodiment, each of the patterns 132-1 to 132-4 may have three or more bands that are parallel to one another.
  • the blind holes 132-2A, 132-2B, and 132-2C may be formed by punching the reflection unit 130. However, the disclosure is not limited thereto.
  • a distance d between the blind holes 132-2A is less than a length L of each of the blind holes 132-2A.
  • the distance d indicates the distance between the blind holes 132-2A in the z-axis direction
  • the length L indicates the length of each of the blind holes 132-2A arranged in the z-axis direction.
  • the holes 132-2A, 132-2B, and 132-2C shown in FIGs. 3A to 3C may be blind holes, as shown in FIG. 2 .
  • the disclosure is not limited thereto.
  • the holes 132-2A, 132-2B, and 132-2C, which form the patterns 132-1 to 132-4 may be through holes.
  • FIG. 4 is a view showing the reflection unit 130 and the lens 124 shown in FIGs. 1 and 2 .
  • x and y indicate respectively the x-axis and the y-axis shown in FIGs. 1 and 2 .
  • the reflection unit 130 may be defined as a function (y') represented by Equation 1.
  • y ′ ⁇ tan ⁇ 1 x + H
  • ⁇ 1 indicates an angle of inclination at which the reflection unit 130 is inclined with respect to a horizontal surface HS in a first direction (e.g. an x-axis direction) passing through the light source unit 120 (e.g. a center P1 of the lens 124)
  • H indicates the distance between the light source unit 120 (e.g. the center P1 of the lens 124) and a contact point P2 in a second direction (e.g. a y-axis direction) parallel to the optical axis LX.
  • the contact point P2 may indicate a point at which the optical member 140 meets the top of the reflection unit 130.
  • the contact point P2 may indicate the upper end of the reflection unit 130.
  • light 126 exiting from the light source unit 120 may be defined as a function (y") represented by Equation 2.
  • y " ⁇ tan ⁇ 2 x + tan ⁇ 2 ⁇ w
  • ⁇ 2 indicates an angle of inclination at which light 126 exiting from the light source unit 120 (e.g. the center P1 of the lens 124) is inclined with respect to the horizontal surface HS
  • w indicates the distance between the light source unit 120 (e.g. the center P1 of the lens 124) and the contact point P2 in the first direction (e.g. the x-axis direction).
  • the patterns 132-1 to 132-4 may be located at a point P3 at which the light 126 reaches the reflection unit 130.
  • the positions X and Y of the point P3 may be derived from Equations 1 and 2 as represented by Equations 3 and 4.
  • X tan ⁇ ⁇ ⁇ 2 ⁇ w ⁇ H tan ⁇ ⁇ 2 ⁇ tan ⁇ ⁇ 1
  • Y ⁇ tan ⁇ 1 tan ⁇ ⁇ ⁇ 2 ⁇ w ⁇ H tan ⁇ ⁇ ⁇ 2 ⁇ tan ⁇ ⁇ 1 + H or
  • Y ⁇ tan ⁇ 2 tan ⁇ ⁇ ⁇ 2 ⁇ w ⁇ H tan ⁇ ⁇ ⁇ 2 ⁇ tan ⁇ 1 + tan ⁇ 2 ⁇ w
  • X may indicate the distance between the contact point P2 and the point P3 of the patterns 132-1 to 132-4 in the first direction (e.g.
  • Y may indicate the distance between the light source unit 120 (e.g. the center P1 of the lens 124) and the point P3 of the patterns 132-1 to 132-4 in the second direction (e.g. the y-axis direction) parallel to the optical axis LX.
  • Equation 5 The angle of inclination ⁇ 2 in Equations 2 to 4 may be represented by Equation 5.
  • ⁇ 2 90 ° ⁇ a 2 + k ⁇ b
  • a and b indicate a beam angle of light exiting from the light source unit 120 and the width of the beam angle, respectively, and k indicates a variable.
  • FIG. 5 is a graph illustrating a beam angle and the width of the beam angle.
  • a vertical axis indicates the normalized intensity of light
  • a horizontal axis indicates angles.
  • a beam angle a is 180 degrees, which is a difference ⁇ B- ⁇ A between angles ⁇ B and ⁇ A, and a width b of the beam angle a is 14.1 degrees, which is a difference ⁇ D- ⁇ C between angles ⁇ C and ⁇ D.
  • the disclosure is not limited thereto.
  • FIGs. 6A to 6C are a plan view, a plan photograph, and a local sectional view showing a light emitting module according to a comparative example, respectively
  • FIGs. 7A to 7C are a plan view, a plan photograph, and a sectional view showing a light emitting module 100 according to an embodiment, respectively.
  • FIGs. 6C and 7C are local sectional views of part 'B' shown in FIG. 2 , in the comparative example and in the embodiment, resepctively.
  • no patterns 132-1 to 132-4 are located at a reflection unit 130 of the light emitting module according to the comparative example.
  • a sectional view B1 of FIG. 6C light, reflected by the reflection unit 130, is scattered, and then exits through an optical member 140 in various different directions. This is because an angle of inclination ⁇ 1 of the reflection unit 130 is different from a beam angle of the light.
  • a Mura phenomenon i.e. contrast spots
  • the difference between brightness 220 of a light exiting area C located at the edge of the optical member 140 and brightness of the central region of the optical member 140 is outstanding may occur.
  • a bright line is generated at the light exiting area C before light reached to a target illuminance surface TS shown in FIG. 2 .
  • the target illuminance surface TS may be a illuminance surface set in order to design an optical module.
  • patterns 132-1 to 132-4 are located at a reflection unit 130 of the light emitting module 100 according to the embodiment.
  • the quantity of light reflected from positions at which the patterns 132-1 to 132-4 are located is reduced, whereby the light may exit through the optical member 140 without being scattered.
  • the difference in contrast between the light exiting area C located at the edge of the optical member 140 and the central region of the optical member 140 is less than that in the comparative example shown in FIG. 6B . That is, referring to FIG. 7B , in the light emitting module 100 according to the embodiment, the bright line is removed from the light exiting area C, thereby improving uniformity in light and solving the Mura phenomenon.
  • the patterns 132-1 to 132-4 which solve the Mura phenomenon, are formed at the reflection unit 130, it is possible to reduce a thickness H of the light emitting module 100.
  • the patterns 132-1 to 132-4 may be easily formed by punching. Consequently, a manufacturing process is simpler than when the patterns are printed on the reflection unit 130 using ink or when the material for a portion of the reflection unit 130 is changed, thereby preventing the increase in manufacturing cost.
  • k may be set considering the characteristics of the light source units 120 or the characteristics between the light source units 120. For example, k may be set considering the distance between the light source units 120. If k is less than 0.35 or greater than 0.65, the difference in contrast between the edge and the center of the optical member 140, i.e. the Mura phenomenon, may be serious. For this reason, k may be set to be 0.35 to 0.65.
  • the disclosure is not limited thereto.
  • the light emitting module according to the previous embodiment may be applied to light emitting apparatuses, such as a lighting apparatus, a display apparatus, and an indicator.
  • the light emitting module may include a lamp or a streetlight.
  • the light emitting module may be applied to a direct type backlight unit.
  • a light emitting module and a light emitting apparatus it is possible to improve uniformity in light, to solve a Mura phenomenon, and to reduce the thickness thereof.
  • patterns are formed on a reflection unit by punching. As a result, a manufacturing process is simpler than when the patterns are printed on the reflection unit using ink or when the material for a portion of the reflection unit is changed, thereby reducing manufacturing cost.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
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Claims (12)

  1. Lichtemittierendes Modul (100), das Folgendes umfasst:
    eine Platte (110);
    mindestens eine Lichtquelleneinheit (120), die sich an der Platte (110) befindet;
    ein optisches Element (140), das sich an der mindestens einen Lichtquelleneinheit (120) befindet; und
    eine Reflexionseinheit (130), die sich geneigt in Bezug auf eine erste Oberfläche (HS) und durch die mindestens eine Lichtquelleneinheit (120) verlaufend zwischen der Platte (110) und dem optischen Element (140) befindet, wobei die erste Oberfläche (HS) in der x-Achsenrichtung und der z-Achsenrichtung eines Koordinatensystems (x, y, z) liegt, wobei
    die Reflexionseinheit (130) ein Muster (132-1 bis 132-4) umfasst, das sich näher am optischen Element (140) als an der Platte (110) befindet, wobei die Menge von Licht, die von einer Position, bei der sich das Muster befindet, reflektiert wird, verringert wird, wobei das Muster (132-1 bis 132-4) mehrere Sacklöcher (132-2A, 132-2B) oder Durchgangslöcher, die in Form einer gepunkteten Linie angeordnet sind, umfasst, dadurch gekennzeichnet, dass
    ein Abstand (d) zwischen den Sacklöchern (132-2A, 132-2B) oder den Durchgangslöchern, die in Form der gepunkteten Linie angeordnet sind, geringer als eine Länge (L) jedes der Sacklöcher (132-2A, 132-2B) oder der Durchgangslöcher ist.
  2. Lichtemittierendes Modul (100) nach Anspruch 1, wobei die mindestens eine Lichtquelleneinheit (120) Folgendes umfasst:
    eine Lichtquelle (122), die sich auf der Platte (110) befindet; und
    eine Linse (124), die sich auf der Lichtquelle (122) befindet, wobei die Lichtquelle (122) und die Linse (124) längs einer optischen Achse (LX) in der y-Achsenrichtung einander überlappen.
  3. Lichtemittierendes Modul (100) nach Anspruch 2, wobei ein Strahlwinkel von Licht, das von der mindestens einen Lichtquelleneinheit (120) abgestrahlt wird, von einem Neigungswinkel der Reflexionseinheit (130) an der Basis der ersten Oberfläche (HS) in einer Richtung senkrecht zur optischen Achse (LX) verschieden ist.
  4. Lichtemittierendes Modul (100) nach einem der Ansprüche 2 bis 3, wobei das Muster (132-1 bis 132-4) die Form mindestens eines Bandes besitzt.
  5. Lichtemittierendes Modul (100) nach einem der Ansprüche 2 bis 4, wobei eine Position, an der das Muster gebildet ist, wie folgt definiert ist: X = tan ⁢ Θ ⁢ 2 × w − H tan ⁢ Θ 2 − tan ⁢ Θ 1 ,
    Figure imgb0014
     Y = − tan Θ 1 tan ⁢ Θ 2 × w − H tan ⁢ Θ 2 − tan ⁢ Θ 1 + H
    Figure imgb0015
     oder Y = − tan Θ2 tan ⁢ Θ 2 × w − H tan ⁢ Θ 2 − tan ⁢ Θ 1 + tan Θ 2 × w ,
    Figure imgb0016
     wobei
    X einen Abstand von einem Kontaktpunkt (P2) zwischen dem optischen Element (140) und der Reflexionseinheit (130) zur Position in einer ersten Richtung senkrecht zur optischen Achse (LX) anzeigt, Y einen Abstand zwischen der Position und der mindestens einen Lichtquelleneinheit (120) in einer zweiten Richtung parallel zur optischen Achse (LX) anzeigt, Θ1 einen Winkel, bei dem die Reflexionseinheit (130) in Bezug auf die erste Oberfläche (HS) in der ersten Richtung, die durch die mindestens eine Lichtquelleneinheit (120) verläuft, geneigt ist, anzeigt, Θ2 einen Winkel, um den Licht, das aus der mindestens einen Lichtquelleneinheit (120) austritt, in Bezug auf die Oberfläche (HS) geneigt ist, anzeigt, w einen Abstand zwischen der mindestens einen Lichtquelleneinheit (120) und dem Kontaktpunkt (P2) in der ersten Richtung anzeigt und H einen Abstand zwischen mindestens einer Lichtquelleneinheit (120) und dem Kontaktpunkt (P2) in der zweiten Richtung anzeigt.
  6. Lichtemittierendes Modul (100) nach Anspruch 5, wobei Θ2 wie folgt definiert ist: Θ 2 = 90 ° − a 2 + k × b ,
    Figure imgb0017
     wobei
    a und b einen Strahlwinkel von Licht, das aus der mindestens einen Lichtquelleneinheit (120) austritt, bzw. eine Breite des Strahlwinkels anzeigen und k eine Variable anzeigt.
  7. Lichtemittierendes Modul (100) nach Anspruch 6, wobei k im Bereich von 0,35 bis 0,65 liegt.
  8. Lichtemittierendes Modul (100) nach einem der Ansprüche 2 bis 7, wobei sich das Muster (132-1 bis 132-4) in Richtung einer Hauptachse (z) und einer untergeordneten Achse (x) der Reflexionseinheit (130) befindet und eine Anzahl der Lichtquelleneinheiten (120), die entlang der Hauptachse (z) angeordnet sind, größer als eine Anzahl der Lichtquelleneinheiten (120), die entlang der untergeordneten Achse (x) angeordnet sind, ist.
  9. Lichtemittierendes Modul (100) nach einem der Ansprüche 2 bis 8, wobei sich das Muster (132-1 bis 132-4) weiter entfernt von der Platte (110) als die am weitesten von der Platte (110) entfernte Oberfläche der mindestens einen Lichtquelleneinheit (120) befindet.
  10. Lichtemittierendes Modul (100) nach einem der Ansprüche 6 bis 9, wobei die Breite b des Strahlwinkels a 14.1 Grad ist.
  11. Lichtemittierendes Modul (100) nach einem der Ansprüche 1 bis 10, wobei eine Oberfläche der Platte (110) auf der Seite der Lichtquelleneinheit (120) mit einem reflektierenden Material beschichtet ist.
  12. Lichtemittierende Vorrichtung, die ein lichtemittierendes Modul (100) nach einem der Ansprüche 1 bis 11 umfasst.
EP15197446.6A 2014-12-08 2015-12-02 Lichtemittierendes modul und lichtemittierende vorrichtung Active EP3032310B1 (de)

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CN105674067A (zh) 2016-06-15
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KR20160069161A (ko) 2016-06-16
CN105674067B (zh) 2020-01-07
US20160161086A1 (en) 2016-06-09

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